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Full text of "Treatise On Applied Analytical Chemistry(Vol-1)"

228

SPECIAL BRASSES

Lead Brasses.

Lead brasses are very soft and therefore suitable for castings to be
worked at the lathe. Their analysis comprises, besides determinations of
copper and zinc, also that of lead and of the impurities usually occurring
in ordinary brass (iron, tin, nickel, sulphur, phosphorus, arsenic, bismuth,
etc.). The analytical methods are exactly those used for ordinary brass

(q.v.).

*
* *

Lead brasses usually contain 1-3% of lead and such impurities as are found
in common brass.

Tin Brasses

Tin brasses are used especially for making tubes, plates, valves, etc.,
for naval construction. They are analysed by the same methods as ordinary
brass (q.v.).

*
* *

Tin brasses contain on the average 60-62% Cu, 37-5-39% Zn and 1-1-5%
Sn.   In this category fall Naval brass, I ton brass and Laveyssi&re bronze.

Manganese Brasses

Manganese is introduced in small quantities into brass to increase the
strength, elasticity and hardness. The constituents of these brasses are
determined as with the complex brasses (see later).

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* *

The two types in most common use have the compositions : (i) 59-60% Cu,
40-41% Zn, traces of Mn, and (2) 58-59% Cu, 39-40% Zn, 1-8-2-2% Mn. They
are used in marine construction, especially for making propellers.

The following table gives the compositions prescribed for manganese brasses
by the American Society for the Testing of Materials and by the Technical Bureau
for Steam Plant of the United States Navy (Indus friz, 1914) :

TABLE XXIII
Compositions of Manganese Brasses


	Cu
	Zn
	Sn
	Fe
	Al
	Mn
	Pb


	
	
	(max.)
	(max.)
	(max.)
	(max.)
	(max.)

American   Society  for   the
	
	
	
	
	
	
	

Testing of Materials . Technical Bureau for Steam 1 Plant of U.S. Navy    .      /
 ,
	55-60 57-60 56-68
	39-45 37-40 40-42
	2
 o-75 I
	2 I I
	o-5 0-50 0-50
	0-5 0-30 0-30
	O-2O